An attempt was made to evaluate the role of insectivorous birds in agroecosystem during 1994-95 at Agricultural Research Station, Gulbarga-585101  Karnataka. Activity of birds from floweing to pod formation stage was meager but increased thereafter till the maturity of the crop. Peak activity of birds was noticed from pod formation to grain filling stage when the crop was heavily infested by the pod borer. The most common Insectivorous birds in pigeonpea ecosystem were black drongo, house sparrows, green bee eater and blue jays. Back drongo and house sparrows accounted to 80 per cent predation. The former spent longest time of 6-7 hr day-¹ inthe field and, devoured highest numberof larvae (7.0 hr^-1 perch^-1)as compared to rest of the birds. Predatory zone was limited to six to eight meters in the case ot inanimate perches (highly branched twig tree and bamboo stick with cross support at the top) and two to four metres  radius in the case of animate perches (sorghum variety with bow head and pundit plants). Among the aerial predatory birds, black drongoes were the most experienced birds. Among the ground predators house sparrows were more efficient. Late Instar larvae measuring between 1.5 to 2.5 cm were preferred (80%, than early instar (20%). It was concluded that the type of crop, stage of the crop, and pest density are important factors to influence the bird species and their predatory behaviour.